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Wind tunnel study of wind loading on rectangular louvered panels
Zuo, D.,Letchford, C.W.,Wayne, S. Techno-Press 2011 Wind and Structures, An International Journal (WAS Vol.14 No.5
Drag forces on a rectangular louvered panel, both as a free-standing structure and as a component in a generic low-rise building model, were obtained in a wind tunnel study. When tested in a building model, the porosity ratio of the wall opposite the louvered panel was varied to investigate its effect on the loading of the louvered panel. Both mean and pseudo-steady drag coefficients were obtained. Comparisons with the provisions for porous walls in contemporary loading standards indicate that for some opposite wall porosity ratios, the standards specify significantly different wind loads (larger and smaller) than obtained from this wind tunnel study.
Wind tunnel study of wind loading on rectangular louvered panels
D. Zuo,C.W. Letchford,S. Wayne 한국풍공학회 2011 Wind and Structures, An International Journal (WAS Vol.14 No.5
Drag forces on a rectangular louvered panel, both as a free-standing structure and as a component in a generic low-rise building model, were obtained in a wind tunnel study. When tested in a building model, the porosity ratio of the wall opposite the louvered panel was varied to investigate its effect on the loading of the louvered panel. Both mean and pseudo-steady drag coefficients were obtained. Comparisons with the provisions for porous walls in contemporary loading standards indicate that for some opposite wall porosity ratios, the standards specify significantly different wind loads (larger and smaller) than obtained from this wind tunnel study.
PARAMETER IDENTIFICATION FOR A LUGRE MODEL BASED ON STEADY-STATE TIRE CONDITIONS
X. D. WU,S. G. ZUO,L. LEI,X. W. YANG,Y. LI 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.5
The purpose of this study was to effectively identify parameters for a LuGre friction model based on experimental measures. In earlier work related to this study (Yang et al., 2009), which was based on the characters of polygonal wear (Sueoka and Ryu, 1997), we showed a frictional vibration model for a mass on a moving belt. This model reflected lateral vibrations caused by velocity and toe-in angle. An important aspect of the present study is the improved friction model. A previous friction model, which divided the process into four parts, expressed the sable excited vibration well but failed to reflect the hysteresis loop change when vehicles accelerated or decelerated continuously. A LuGre friction model can solve this problem, but several model parameters must be obtained experimentally. We measured contact width and length of tires as vertical pressure changed; this provided a theoretical basis for apparent stiffness of a unit of tire tread. Based on tire data from Bakker E’s article in a SAE paper from 1987, we identified the Stribeck exponent and Stribeck velocity in LuGre. Then, the results were implemented in a vibration system that verified the rationality of the data.
PREDICTION PROCEDURE FOR WEAR DISTRIBUTION OF TRANSIENT ROLLING TIRE
S. G. ZUO,T. X. NI,X. D. WU,K. WU,X. W. YANG 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.3
As a research method, finite element analysis (FEA) with ABAQUS can help researchers to study throughoutthe whole process of abnormal tire wear. For precise tread wear simulation, this paper introduces a tire finite element modelbuilding method. Then, the model is verified by comparing its simulation results with experiment data. Based on the verifiedmodel, tire high-speed rolling procedure is presented by combining steady-state transport analysis and dynamic analysis. Topredict the wear distribution, micro tread wear calculation method is described. Finally, the wear prediction procedure of treadmesh evolving is introduced and tire polygonal wear pattern is simulated by this procedure.
Meng, Li-Juan,Zuo, Hua,Vijaykumar, B.V.D.,Dupati, Gautam,Choi, Kyung-Min,Jang, Kiwan,Yoon, Yong-Jin,Shin, Dong-Soo Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.2
Optically active N-benzyl-2-methyl-2H-benzo[b][1,4]oxazin-3(4H)-ones and N-benzyl-2-methyl-2H-benzo[b][1,4]thiazin-3(4H)-ones with potential synthetic and pharmacological interest were prepared via Smiles rearrangement in conventional as well as microwave irradiation conditions in one-pot from inexpensive (S)-2-chloropropionic acid. Most of the compounds displayed good inhibition against Gram positive bacteria and fungi in the antibiotic test.
Li-juan Meng,Hua Zuo,B. V. D. Vijaykumar,Gautam Dupati,Kyung-Min Choi,장기완,윤용진,신동수 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.2
Optically active N-benzyl-2-methyl-2H-benzo[b][1,4]oxazin-3(4H)-ones and N-benzyl-2-methyl-2H-benzo [b][1,4]thiazin-3(4H)-ones with potential synthetic and pharmacological interest were prepared via Smiles rearrangement in conventional as well as microwave irradiation conditions in one-pot from inexpensive (S)-2- chloropropionic acid. Most of the compounds displayed good inhibition against Gram positive bacteria and fungi in the antibiotic test.
Liu, Yongjing,Xu, Pengcheng,Yu, Haitao,Zuo, Guomin,Cheng, Zhenxing,Lee, D.-W.,Li, Xinxin The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.34
<P>A hyper-branched polymer is layer-by-layer self-assembled on a resonant micro-cantilever and, then, functionalized with sensing-terminals for the specific detection of the trace chemical vapor of dimethyl methylphosphonate (DMMP, a typical simulant for nerve agents). The hyper-branched polymer is directly constructed on the SiO<SUB>2</SUB> surface of the cantilever <I>via</I> an A<SUB>2</SUB> + B<SUB>4</SUB> layer-by-layer route, where A<SUB>2</SUB> and B<SUB>4</SUB> are complementary interacting groups which undergo coupled linking. After modification with 4-(2-(4-(allyloxy)phenyl)-1,1,1,3,3,3-hexafluoropropan-2-yl)phenol (APHFPP) groups specific to DMMP, the high specific-surface-area hyper-branched polymer provides very dense sensing sites to adsorb a great number of DMMP molecules for micro-gravimetric detection. Moreover, the sensing polymer possesses a “more branches but fewer roots” configuration on the cantilever surface to depress the cross-talk effect caused by adsorption induced cantilever spring-stiffening. Experimental results indicate that, self-assembled with the hyper-branched sensing polymer, the resonant cantilevers exhibit rapid and reproducible detection of trace DMMP (with the detection limit lower than 7.2 ppb) and effectively depressed parasitic frequency-shift from the cantilever spring stiffening effect. In addition, the sensor features satisfactory selectivity in the presence of water and organic solvents. When an alternative sensing-group of 2-allylhexafluoroisopropanol (AHFIP) is modified on the hyper-branched architecture, the cantilever becomes specifically sensitive to trace explosive vapor. Therefore, the developed technique for the functionalization of hyper-branched polymer directly grown on a cantilever provides a widely usable micro/nano sensing-platform for the detection of trace chemical vapors.</P> <P>Graphic Abstract</P><P>A hyperbranched polymer is directly grafted onto a resonant micro-cantilever surface. The polymer is functionalized with sensing terminal groups and it exhibits the selective, rapid and reproducible detection to trace dimethyl methylphosphonate, with the detection limit lower than 7.2 ppb. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm33202g'> </P>
Y. Q. Li,M. Yue,J. H. Zuo,D. T. Zhang,W. Q. Liu,J. X. Zhang,Z. H. Guo,W. Li 한국자기학회 2013 Journal of Magnetics Vol.18 No.3
A finite element model was built for MnBi/α-Fe nanocomposite permanent magnets, and the demagnetization curves of the magnets were simulated by micro-magnetic calculation. The microstructure of the cubic model is composed of 64 irregular grains with an average grain size of 20 nm. With the volume fraction of soft magnetic phase (t vol. %) ranged from 5 to 20 vol. %, both isotropic and anisotropic nanocomposite magnets show typical single-phase permanent magnets behavior in their demagnetization curves, illustrating good intergranular exchange coupling effect between soft and hard magnetic phases. With the increase of volume fraction of soft magnetic phase in both isotropic and anisotropic magnets, the coercive force of the magnets decreases monotonically, while the remanence rises at first to a peak value, then decreases. The optimal values of maximum energy products of isotropic and anisotropic magnets are 84 and 200 kJ/m3, respectively. Our simulation shows that the MnBi/α-Fe nanocomposite permanent magnets own excellent magnetic properties and therefore good potential for practical applications.